KW, there are tons of classes before, and during the show, by all of the world class quilters. But, you have to sign up early! There are also some smaller classes offered during the show on the floor of the convention center - they are more informal and you wouldn't bring your sewing machine.
Every manufacturer displays at Houston. You should have seen the mob last year around the HQ16 booth. Personally, I have my eye on a Viking 17 with a Hinterberg frame. You can "test drive" every single system out there at Houston.